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v <br /> A S S O C I A T E S I N C . <br /> Vapor Analytical Results <br /> No vapor samples were collected from the vapor extraction system during the fourth quarter 2004 <br /> monitoring events. Historical vapor analytical data is provided in Table 4. <br /> Water Treatment System Analytical Results <br /> Although the vapor system was not operated during the fourth quarter 2004, a water sample was <br /> collected on November 5, 2004. The water samples collected from the Influent, Effluent, and Vessel 1 <br /> ports contained nondetectable concentrations of TPHg, BTEX, MTBE, TBE, TAME, DIPS, ETBE, 1,2- <br /> DCA, and EDB. The water samples were collected for purposes of compliance. <br /> A summary of analytical results is presented in Table 5. Groundwater laboratory data sheets and chain- <br /> of-custody documentation are contained in Attachment 2. <br /> Air Sparge System Monitoring <br /> During the current reporting period, ATC personnel did not monitor the air sparge system since it was not <br /> operated. <br /> REMEDIATION SYSTEM EVALUATION <br /> Vapor Extraction System Evaluation <br /> From September 27 to December 31, 2004,the vapor extraction system was inoperational and removed <br /> from the site. Since the system was inoperational during this time, 0 lbs of TPHg were removed during <br /> the fourth quarter 2004. <br /> Total TPHg removed via vapor extraction since system startup on December 19,2002: <br /> 8648 lbs of TPHg total as of third quarter 2004+0 pounds of TPHg fourth quarter 2004= 8,648 pounds <br /> of TPHg removed since the startup of the system. <br /> Total benzene removed via vapor extraction since system startup on December 19, 2002: <br /> 20.75 lbs benzene removed total as of third quarter 2004+0 Ib benzene fourth quarter 2004 = 20.75 <br /> pounds of benzene removed since the startup of the system. <br /> • <br /> s:lenviro1625961quartlyl4gr-2004.doc 6 <br />